Removed database model for deleting incoming objects. Now just picks them up from the local_settings file as per 0.6. These are displayed in the dicomsummary. Also prettified the tables and links to start/stop/modify/delete the stores. Refs #263

Added model for Patient ID Settings as a solo singleton model, including adding django-solo. Editable using the admin interface. Refs #183. Should use the same method for the DICOM delete options, ref #263